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On Wed, Sep 16, 2020 at 06:36 AM, Ham Radio wrote:

Thanks Herb. ?A bit confusing for the first time user.

I just learned that you can use a serial terminal to connect with TinySA. ?Not sure if you need to be in regular mode ?or ?DFU mode to do that function and what speed to set the COMM port. ?

The PC Control description on TinySA.org needs to be expanded a bit more to describe the serial communication feature and perhaps, ?a link to the list of shell commands.

Bernie,
? A lot of tinySA users have prior familiarity with the NanoVNA which uses the same DFU upgrade procedure.? The DFU mode can only be used for upgrading.? To use the tinySA from a serial terminal you have to exit from the DFU mode and return to normal USB mode.? USB always transfers at the fastest speed rated for the selected port so speed settings in the serial terminal are not applicable.

?To get a list of the available shell commands just type 'help' from the serial terminal.

- Herb

On Wed, Sep 16, 2020 at 06:28 AM, Scott hunter wrote:

"with an external ittenuator what is the maximum input the spectrum annalyzer would handle 1dbm or 2 dbm or even lower any chance could u give me a accurate reading"

? ?Scott that's kind of a loaded question because it depends on the level of the signal you are measuring and the attenuator you are using.? See this page for maximum input ratings for both the LOW and HIGH inputs,??.? For best measurement accuracy Erik recommends that you choose an external attenuator that reduces your signal to -20dBm on the low port and -30dBm on the high port.? Use the LEVEL->EXTERNAL AMP setting to correct for the external attenuator.

"..also did u design this spectrum annalyzer?thanks for replying .."

? Erik is the proud designer of the tinySA and knows it backwards and forward.? He also maintains the firmware and the tinySA.exe software.? That is why he is able to respond so quickly to user input.? The tinySA is a result of almost a year of design work that originally started on the? Amatuer Radio Homebrew Test Equipment group.

- Herb

Scott, you can find the specification of the TinySA here:?

It lists the maximum input power as 10dBm - anything more and you will likely fry it. For a "good" reading, I try to keep the input signal below -30dBm.?

Thanks Herb. ?A bit confusing for the first time user.

I just learned that you can use a serial terminal to connect with TinySA. ?Not sure if you need to be in regular mode ?or ?DFU mode to do that function and what speed to set the COMM port. ?

The PC Control description on TinySA.org needs to be expanded a bit more to describe the serial communication feature and perhaps, ?a link to the list of shell commands.
--
73, Bernie, VE3FWF
(most typos in this message were generated by highly sophisticated auto-correction software)

The noise measurement page is updated

The input power of the fundamental should be as low as possible to avoid the tinySA generating internal harmonics. But the fundamental should also be so strong the harmonics do not disappear into the noise.
In this example:?
you see that keeping the fundamental just below -25dBm (with 0dB attenuation, increase attenuation if you increase the level of the fundamental) gives the largest measurement range of observing harmonics.
The first example in this video:?
shows the measurement of a signal with harmonics where the fundamental is at -25dBm
A practical example of measuring the harmonics from an actual transmitter can be found here:?

hi purchased one of thease. spectrum annalyzers are new to me still learning. what would be the maximum input power for checking harmonics ?on the tinysa? if anyone could reply that be great thanks m6set 73...

On Tue, Sep 15, 2020 at 11:55 PM, Bonzo wrote:

For this method of NF measurement it is important that the noise contribution of the DUT is
dominant over the noise of the S.A. itself.

I will adapt the page to use two amplifiers, just like in the Keysight instructions.
With one amplifier I did not see the noise increase (unless I added the input resistive termination) so the calculation is wrong.

Hi Erik,

For this method of NF measurement it is important that the noise contribution of the DUT is
dominant over the noise of the S.A. itself.

One can easily check this in your example by powering off the amplifier. The measured noise level
should then significantly drop. Minimum 10 dB, better 20dB. Otherwise the S.A. adds too much noise
in this setup and the calculated result is wrong.

So this step should be added in the procedure.

On Tue, Sep 15, 2020 at 06:02 PM, Ham Radio wrote:

Erik:

On the TinySA flash page, when it boots, it says in bold letters “tinySA v0.3”

I assume this is the version of the boot loader?

Bernie,
? v0.3 is the production hardware revision.? The beta hardware revision was v0.2.

?- Herb

Erik:

On the TinySA flash page, when it boots, it says in bold letters “tinySA v0.3”

I assume this is the version of the boot loader?

--
73, Bernie, VE3FWF
(most typos in this message were generated by highly sophisticated auto-correction software)

Thanks. I'm confused about terminating the input with a resistor. This increases the noise considerably.
The rest seems ok

See this Keysight web page for procedure.

Gary
W9TD

Ah,

Unplug the tinySA, wait for the beep, plug in again, wait for the beep and try again.

tinySA.exe may hang in a hidden state waiting in deadlock

On Tue, Sep 15, 2020 at 08:56 AM, Martin wrote:

Data over Power line adaptor

Is terrible, my neighbours are using them. I had to put chockes over all the mains electricity cables where they enter my home, including the ground cable.

Remember you can do DISPLAY/STORAGE/STORE TRACE to save a trace short term and after that you can do a PRESET/STORE/STORE x to save the stored trace to flash so you can recall them any time you want.
You can extract them to a PC using the "frequencies" and "data 1" console commands

?

I have just found it works fine on my other Windows 10 PC. Same TinySA, same TinySA.exe. Odd.